Clematis pengii Y.H. Cheng & T.Y.A. Yang, 2024

Cheng, Yuan-Hao & Yang, Tusng-Yu Aleck, 2024, Two new taxa of Clematis subsection Pierotianae (Ranunculaceae) in Taiwan, Phytotaxa 662 (1), pp. 19-36 : 30-34

3. Clematis pengii Y.H. Cheng & T.Y.A. Yang , sp. nov. ( Fig. 1E , 9 , 10D–F )

Type:— TAIWAN, Pingtung County, Chunjih Township, Tahan Forest Road, Y.H. Cheng et al. 1783, 15 Jun. 2020 (holotype: TNM; isotypes: HAST, PPI, TAI, TAIF, TI, TNM) .

Diagnosis:— Clematis pengii is similar to C. formosana , but can be distinguished by acuminate (vs. acute) apex of the leaflets, unlobed margin (vs. sometimes deeply lobed), sepal size (12.4–18.6*4.8–6.7 vs. 4.3–12.2*2.3–4.9), number of stamens (78–116 vs. 30–45), and phenology (flowering in Jun. to Sep. vs. flowering in Oct. to Dec.).

Description: — Vines, woody, scandent, perennial, caulicle olive green, sulcate, velutinous. Mature woody stems brown, becoming glabrous. Leaves ternate, phyllotaxy alternate in seedlings and suckers, opposite at maturity. Leaflets 3, membranous to chartaceous, ovate or ovate–lanceolate, apex acuminate, base obtuse to cuneate, margin serrate or entire, unlobed; sparsely pubescent on both surfaces, trichomes mainly distributed on veins; terminal leaflet 55.3– 86.1 mm long, 14.2–29.5 mm wide; lateral leaflet 29.1–51.9 mm long, 11.7–23.3 mm wide, asymmetrical. Petiole and petiolules tendril–like, sparsely pubescent. Inforescences cymes, axillary, flowers 1–9 or more. Pedicels densely velutinous. Bracts and bracteoles ovate or leaf-like, decussate on peduncle and pedicels. Flowers spreading, 25.4–38.2 mm in diameter. Sepals 4, white, revolute, 12.4–18.6 mm long, 4.8–6.7 mm wide, ovate to elliptic, apex mucronulate, base acute, adaxial glabrous, abaxial densely velutinous. Stamens 78–116, glabrous, 9.6–12.3 mm long, filaments white, linear, swollen at base; anthers white, turning black after dehiscence, 0.8–1.2mm, narrowly–elliptic, longitudinally dehiscent, connectives shorter than pollen sacs. Carpels 7–13, sericeous, 6.4–7.8 mm long. Achene brown or black, 4.2–5.3 mm long, 2.8–3.9 mm wide, ovoid to globose, densely white puberulous. Style persistent, 19.4–40.3 mm long, with pale yellow or white hairs.

Phenology: —Flowering between June to August, and fruiting between July to October.

Distribution: —Endemic to Taiwan, at forest margins, between 500–1500 m elevation in central to southern Taiwan (Chiayi County, Tainan City, Kaohsiung City, and Pingtung County) ( Fig. 8 ).

Etymology: —The specific epithet “ pengii ” honors Prof. Dr. Ching-I Peng (彭鏡毅), the first collector of Clematis pengii in Taiwan.

Chinese name:—彭RLJ線®

Specimen examined:— TAIWAN: Chiayi County: Alishan Township , Shanmei, H.F. Yen 13710, 29 Dec. 1996 ( TNM), Shihmengku, Y.Y. Lin s.n., 4 Aug. 2005 ( TNM) ; Chuchi Township, Mt. Tulishan, T.Y.A Yang et al. 26003, 14 Jul. 2020 ( TNM), 26101, 19 Sep. 2020 ( TNM), Y H. Cheng et al. 667, 12 Aug. 2019 ( TNM), 902, 12 Oct. 2019 ( TNM), 940, 19 Oct. 2019 ( TNM), 1704, 19 Sep. 2020 ( TNM), Juili, Y.H. Cheng et al. 848, 12 Oct. 2019 ( TNM), Mt. Tienyunshan , C.I Peng 8833, 1 Nov. 1985 ( HAST) ; Fanlu Township , Mt. Tufeishan, C.J. Haung 94, 26 Oct. 2014 ( CHIA) ; Tapu Township , H.Y. Hsieh 232, 22 Jul. 2007 ( PPI), Shuisheliao, Y H. Cheng et al. 952, 26 Oct. 2019 ( TNM) . Tainan City: Tungshan District, Mt. Cantoushan, C. I Peng 7073, 28 Jul. 1984 ( HAST, TNM), P.H. Lin 35, 17 Jul. 2013 ( TNM), T.Y.A. Yang et al. 4122, 18 Jul. 1988 ( TNM), 4214, 14 Sep. 1988 ( TNM), 26047, 6 Aug. 2020 ( TNM), 26107, 19 Sep. 2020 ( TNM), Y H. Cheng et al. 1647, 6 Aug. 2020 ( TNM) . Kaohsiung City: Chiahsien District , Mt. Piyunshan, H.F. Yen 2664, 28 Jul. 1988 ( TNM) ; Liukuei District, Shaping, S.W. Chung 4513, 1 Aug. 2001 ( TAIF), Mt. Nanfengshan, J.C. Wang 5185, 28 Jen. 1989 ( HAST) ; Maolin District, Fengkang forest road, H.L. Chiang 1426, 6 Jul. 2000 ( TAIF), C.I Huang 3468, 12 Aug. 2008 ( HAST) . Pingtung County: Chunjih Township, Dahan forest road, T.Y.A. Yang et al. 25794, 1 Dec. 2019 ( TNM), 26164, 12 Jul. 2021 ( TNM), C.F. Chen et al. 2143, 23 Jun. 2006 ( PPI), Y.H. Cheng et al. 756, 20 Sep. 2019 ( TNM), 767, 20 Sep. 2019 ( TNM), 1081, 28 Dec. 2019 ( TNM), 1520, 15 Jul. 2020 ( TNM), 1783, 12 Jun. 2020 ( TNM), 1858, 3 Oct. 2021 ( TNM), Chinshuiying, Y.J. Lin 55, 20 Aug. 2006 ( PPI) ; Shihzih Township , Mt. Lilungshan, Y.H. Cheng et al. 1780, 17 May 2021 ( TNM) ; Laiyi Township, C.K. Fu 39, 2 Aug. 2009 ( PPI), Mt.Yidingshan, J.J. Chen 49, 29 Jun. 2005 ( PPI), J.C. Wang 8446, 10 Jul. 1993 ( TAIF), K.P. Lo et al. 193, 17 Aug. 2002 ( PPI, TNM), G.P. Hsieh et al. 2586, 20 May 2005 ( TAIF). 4. Clematis tamurae T.Y.A. Yang & T.C. Huang (1995: 239) . Type:—TAIWAN, Pingtung County, Manchou Township , Mt. Nanrenshan , T.Y.A. Yang & K.H. Wang 6119, 7 Jul. 1992 (holotype: TAI!; isotypes: HAST!, K!, PE!, TNM!, TNU!). ( Fig. 1C )

Clematis austro –taiwanensis Tamura in scheda; TAI!

Note: Clematis tamurae is the most widely distributed species in subsection Pierotianae in Taiwan.It varies considerably in leaf morphology. Individuals in southern Taiwan have typically smaller leaves and numerous irregular lobes and serrations; the leaves tend to be ovate to lanceolate and have fewer lobes and serrations in some individuals in central to northern Taiwan.

Phenology: —Flowering between June to September, and fruiting between July to October.

Distribution: —Endemic to Taiwan, in open areas and at forest margins, between 300–1800 m elevation.

Chinese name:—H村RLJ線®

Specimen examined:— TAIWAN: Taoyuan City: Fushing District, Paling—Sule, J.C. Wang 10486, 14 Aug. 1997 (TAIF). Miaoli County: Taian Township, Erpensung—Hsuchien, T.C. Huang & S.F. Huang 15385, 12 Nov. 1991 (TAI, TNM), S.W. Tsai 25, 1 Sep. 2014 (TAIF). Taichung City: Hoping District, Tahsuehshan forest road, Y.H. Cheng et al. 755, 14 Sep. 2019 (TNM), 786, 21 Sep. 2019 (TNM), 820, 3 Oct. 2019 (TNM), 1649, 13 Aug. 2020 (TNM), 1836, 29 Aug. 2021 (TNM), Wushihkeng, H.Y. Shen 204, 24 Oct. 1994 (HAST, TNM). Nantou County: Hsinyi Township, Shalisiansea forest road, T.Y.A.Yang 3717, 30 Aug. 1987 (TNM), T.C. Hsu 972, 20 Sep. 2007 (TAIF), Patungkuan, T.Y.A. Yang et al. 5970, 2 Apr. 1992 (TNM); Jenai Township, C.H. Chen 6896, 11 Oct. 2005 (TNM); Luku Township, Hsitou, T.Y.A. Yang 3151, 14 Sep. 1986 (TNM), 3641, 25 Aug. 1987 (TNM), S.J. Moore 332, 26 Apr. 1986 (TNM), Sunlinksea road, T.Y.A.Yang et al. 26081, 27, Aug. 2020 (TNM), Y.H. Cheng 1666, 27 Aug. 2020 (TNM), 1674, 27 Aug. 2020 (TNM). Chiayi County: Alishan Township, Peitzutung forest road, Y.H. Cheng et al. 1661, 18 Aug. 2020 (TNM), T.Y.A. Yang et al. 26106, 19 Sep. 2020 (TNM), Shimeokuo Y.Y. Lin s.n., 4 Aug. 2005 (TNM), Tefuyeh Historic trail, Y.H. Cheng et al. 687, 13 Aug. 2019 (TNM), 944, 26 Oct. 2019 (TNM), 1070, 28 Dec. 2019 (TNM); Chuchi Township, Mt. Tulishan, Y H. Cheng et al. 891, 12 Oct 2019 (TNM), Shuisheliao, Y.H. Cheng et al. 681, 12 Aug. 2019 (TNM). Kaohsiung City: Taoyuan District, The South-Cross Highway, C.Y. Chiang & P.C. Wang 3121, 26 Jul. 1986 (TNM), C.S. Kuoh 12233, 25 Jul. 1987 (TNM), Likuan Bridge, C.S. Kuoh 11132, 21 Feb. 1987 (TNM), Tengchih, T.C. Huang 14436, 15 Oct. 1989 (TAI). Pingtung County: Chunjih Township, Tahan forest road, T.Y.A. Yang et al. 22467, 21 Nov, 2009 (TNM), Y.H. Cheng et al. 771, 20 Sep. 2019 (TNM), 1049, 1 Dec. 2019 (TNM), 2410, 21 Jun. 2022 (TNM); Hengchun Township, Mt. Chihniu, S.W. Chung 9092, 4 Aug. 2007 (TAIF), Ligang Township, Ariko-banti, E. Matsuda s.n., 19 Jul. 1919 (TAI, TAIF); Liuchiu Township, Hsiaoliuchiu, T.Y.A. Yang 4121, 18 Jul. 1988 (TNM); Manchou Township, Mt. Silingeshan, T.Y.A. Yang et al. 21477, 21 Feb. 2009 (TNM), Y.P. Cheng 3303, 1 Aug. 2000 (TAIF), Mt. Nanjenshan, C.I. Peng 5538, 30 Jul. 1983 (HAST, TNM), T.Y.A. Yang et al. 4215, 14 Sep. 1988 (TNM), 5681, 24 Jul. 1991 (TNM), 4353, 28 Jan. 1989 (TNM), 13844, 6 Jul. 2001 (TNM), 23113, 27 Jun. 2011 (TNM), S.P. Li 258, 12 Jul. 1994 (TNM), G.F. Kuo 1123, 2 Aug. 2000 (TAIF), Nanjenhu trail, Y.H. Cheng 1158, 7 Feb. 2020 (TNM), Y.H. Cheng & C.Y.I. Fu 1665, 15 Aug. 2020 (TNM), Lanjenhsi, C.I. Hwang 38, 25 Jan. 2003 (TNM), Mt. Wanliteshan, C.I. Hwang 137, 01 Feb. 2004 (TNM); Mutan Township, Kaoshih, C.M. Wang et al. 2684, 16 Jul. 1997 (TNM); Shihzih Township, Mt. Laofoshan, T.T. Chen 129, 7 Jan. 1993 (TAIF), 487, 16 Feb. 1993 (TAIF), Shouka, Y.H. Cheng et al. 1654, 15 Aug. 2020 (TNM), Shuangliu, T.T. Chen 3912, 23 Apr. 1994 (TAIF); Tawu Township, Z.Y. Chen s.n., 7 Jul. 1990 (TNM); Taiwu Township, Mt. Peidawushan, C.F. Chen et al. 2880, 12 Sep. 2007 (TNM); Wutai Township, H.S. Fu 31008, 31 Jan. 2005 (TNM). Ilan County: Tatung Township, Prov. road #7 Hwg, T.Y.A. Yang et al. 16665, 9 Dec. 2002 (TNM). Hualien County: Fengpin Township, Mt. Paliwanshan, C.H. Chen et al. 8335, 28 Jul. 2007 (TNM); Hsiulin Township, Mt. Chingshuisha, H.L. Ho & Y.I Lien 1257, 23 Jul. 1993 (HAST), Tatung—Chingshuisha, C.Y. Chang 1974, 29 Jul. 2018 (TNM), Shakatang logging trail, C.T. Chao 4634, 28 Jul, 2018 (TAIF). Taitung County: Beinan Township, Lichia forest trail, P.F. Lu 16560, 25 Jul. 2008 (HAST, TAIF), Tungho Township, Tulanshan, C.S. Wu 15071, 31 Oct. 1997 (TAIF, TNM); Haituan Township, Nanhsi, T.Y.A. Yang et al. 15090, 22 Jun. 2002 (HAST, TNM), Yenping Township, Hungyeh, Yenping Forest Road 7 K, C.S. Wu 2078, 11 Jul. 2001 (TNM).

Figures

FIGURE 1. Morphological characters amongst the species of Clematis subsect. Pierotianae in Taiwan. A C. formosana B C. parviloba subsp. bartlettii C C. parviloba subsp. shengzhenii D C. pengii E C. tamurae: 1 leaf (adaxial) 2 leaf (abaxial) 3 leaf vesture (abaxial) 4 flower (front view) 5 flower (lateral view) 6 flower (back view) 7 sepal (adaxial) 8 sepal (abaxial) 9–11 stamen 12 carpel 13 achene.

FIGURE 8. Distribution map of Clematis pengii Y.H. Cheng & T.Y.A. Yang.

FIGURE 9. Line drawings of Clematis pengii Y.H. Cheng & T.Y.A. Yang: A habit B Immature stamen B’ mature stamen C carpel D sepal (adaxial) D’ sepal (abaxial) E achene.

FIGURE 10. Two new taxa. A–C C. parviloba subsp. shengzhenii D–F C. pengii: A & D habitat B & E leaves C & F flower.